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Rather than converting from parts to pci_sbdf_t and vice versa, > > > introduce a new function that parses a PCI string into a pci_sbdf_t structure > > > directly. > > > > > > Signed-off-by: Teddy Astie > > > --- > > > xen/drivers/pci/pci.c | 18 ++++++++++++++++++ > > > xen/include/xen/pci.h | 3 +++ > > > 2 files changed, 21 insertions(+) > > > > > > diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c > > > index 084be3880c..1d06cb035b 100644 > > > --- a/xen/drivers/pci/pci.c > > > +++ b/xen/drivers/pci/pci.c > > > @@ -202,3 +202,21 @@ const char *__init parse_pci_seg(const char *s, unsigned int *seg_p, > > > return s; > > > } > > > + > > > +const char *parse_pci_sbdf(const char *s, pci_sbdf_t *sbdf) > > > +{ > > > + unsigned int seg, bus, dev, func; > > > + const char *out = parse_pci(s, &seg, &bus, &dev, &func); > > > > IMO, both parse_pci() and parse_pci_seg() should be merged into > > parse_pci_sbdf() and parse_pci_sbdf_seg() at the end of the series, > > since there will be no remaining consumers of the old APIs. > > > > What do you think? > > > > That was my plan, but parse_phantom_dev() (in xen/drivers/passthrough/pci.c) > wants to parse the PCI string without the function part (i.e XXXX:YY:ZZ) > which can't be expressed with a full SBDF parse function. I see. Perhaps adding "SBD" parsing in-place in parse_phantom_dev() is OK? Like duplicate a small amount of code but drop old APIs. > > It currently works by passing NULL to `func_p`, which has special handling > in parse_pci. > > We could eventually allow omitting PCI function and make default it to zero, > so that we will be able migrate parse_phantom_dev to this new function (so > it now allows parsing full SBDF, but ignore the function part of it). >